In this paper, we propose two architectural arrangements to build localized and independent intelligent medical networks. These networks constantly monitor the specific needs of the patients and resources of the locality, with the involvement of medical service providers (MSP). The MSPs would serve the medical and informational needs of their client patients. A large number of these MSPs would serve a community or a region. Each MSP (i) will retain a portfolio of each of the client patient (j) and perform a daily check on the changes of status in the local or global information or service as it pertains to the medical history of the particular client patient and makes the patient aware of any detail as it may affect the course of action. If the patient goes through the MSP, then the incremental change is up dated in the patient database. In addition, the system performs the routine medical functions as a hospital staff would perform but retains the information over the life of the individual in and out of every ailment and its treatment. The details of the databases and their distribution or their aggregation, are presented in the two architectural arrangements.

The fundamental limits of the outside loop plant to carry high-speed digital (bi-directional HDSL and ADSL) data are reported. The paper focuses on the copper wire pairs, drop lengths, and interconnects that convey data over the “last mile” to almost all businesses and residences in the US. The two major customers, businesses and households, are classified, characterized, and categorized by the distance to the central office or the remote terminal. Their spectral capabilities are computed and their ultimate digital capabilities are reported. The crosstalk limitations inherent in the plant are also computed and verified against the loss of signal due the distance and spectral constraints. The signal to noise ratio can thus be estimated to ascertain the transmission quality through the plant. Accordingly, the paper reports on losses, bandwidths, and bit rates in the first half, and discusses the major bottlenecks in the second half

The authors report a method for the reduction of the near-end echo in the subscriber loop environment for primary-rate ISDN full-duplex data transmission. The technique uses an RC network as the matching input line impedance at the transmitter to reduce the near-end echo. Data rates ranging from the ISDN basic rate with (2B+D) channels to primary rate with (23B+D) channels are covered. The results indicate that a single basic configuration for the balancing line impedance may be adapted to keep the transhybrid loss in the range of about 22 dB in the worst case over the entire frequency range of interest. The balancing procedure for the hybrid takes place in a training sequence during which the component values of the RC matching circuit are adjusted from their initial values by an iterative adaptation procedure. Two techniques for optimizing the component values have been verified. For all cases examined, including worst-case line configurations, the components of the RC matching circuit have converged to final values, for which the minimum transhybrid loss had a maximum above 20 dB.>

This paper explores the constraints on the design of twowire repeaterless digital subscriber loop (DSL) systems. Broadly categorized, the design depends on the technical feasibility of the approach used to achieve two-wire transmission, constraints related to compatibility with other systems sharing the same cable, and immunity to central office noise. Each of these varies With the choice of system parameters including the transmission rate, transmit power, choice of line codes, etc. Technical feasibility is evaluated by computer simulation studies. Compatibility with other systems is explored by crosstalk calculations. Noise immunity considerations, as they translate into digital line power levels, are also explored.

The design, fabrication, and experimental evaluation of an exploratory 8.2 W, microwave FM power amplifier for the 4-GHz band are presented. It operates on a frequency divide, amplify, and multiply scheme receiving about 2-4 dBm of FM signal in the 4-GHz band, divides the frequency coherently by two, amplifies the modulated signal to about 10.4 W, and doubles the frequency coherently, yielding about 8.2 W into standard 50-ω 4-GHz load, with an overall efficiency of about 30 percent. Frequency halving is accomplished by a wideband regenerative frequency divider yielding about 1-2 dBm of signal at 1995 MHz. The signal is amplified by commercial class C amplifiers and is restored to the 4-GHz band by a stacked varactor containing two 0.32 ω, 15-pF chips in a coaxial embodiment. This entire ensemble, with a total breakdown of 160 V, serves as a frequency doubler.

The numerical solution of vector field problems on digital computers is a slow process, especially when the characteristics of the regions investigated vary considerably. A method for the acceleration of the convergence of iterative procedures is described and applied to linear and non-linear problems. Physical considerations based on Stokes' theorem are utilized to modify Southwell's relaxation technique.